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实验通风柜的使用基本常识
发表时间:2016-12-23     阅读次数:     字体: С
  1. 保证实验室换气次数
    通常情况下,我们认为实验室应保证6-12 次/小时的换气次数。如果将排风系统如通风柜排风作为实验室气流控制的一级控制,则通常要求保证换气次数为4-12 次/小时。但是当实验室有较大的排风要求(较多通风柜)或实验室内热负荷较高(如有较多分析设备)时,可能会要求更多的换气次数。

    1. Ensure laboratory air changes

    Normally, we believe that the laboratory shall ensure that 6 and 12 times per hour of ventilation rate. If the exhaust system, such as fume hood exhaust as laboratory airflow control the level of control, is usually required to ensure ventilation rate of 4 to 12 times/h. But when laboratory have larger ventilation requirements (more) of the fume hood or laboratory internal heat load is higher (such as more analysis equipment), may require more air changes.
    2.防止气流交叉污染
    保障实验室气流不断更新,防止在工作日实验室内的毒害气体浓度增加。所有化学实验室内的空气都应被排放出室外而不得循环使用。因此,要保证实验室内衡为负压,实验室不会对周边区域形成交叉污染。

    2. To prevent cross contamination

    Security laboratory airflow constantly updated, to prevent the laboratory during the week poison gas concentration increased. All the chemical experiment indoor air should be emitted from outdoor and shall not use cycles. Therefore, to ensure that the laboratory scale for the negative pressure, the lab will not form a cross contamination to the surrounding areas.

    3.如何对健康有益
    实验室内在不使用通风柜时也要时常通风,这样对试验人员的身体健康有益。通风橱在使用时,每2小时进行10分钟的补风(即开窗通风),使用时间超过5小时的,要敞开窗户,避免室内出现负压。
    禁止在未开启通风柜时在其通风柜内做实验;
    禁止在做实验时将头伸进通风柜内操作或查看;
    禁止通风柜内做国家禁止排放的有机物质与高氯化合物质混合的实验;
    禁止在没有安全的情况下将所实验的物质放置在通风柜内实验,一旦出现化学物质喷溅出来,应立即将电源切断;
    通风橱的操作区域要保持畅通,通风柜周围避免堆放物品 操作人员在不使用通风橱时,通风橱台面避免存放过多试验器材或化学物质,禁止长期堆放。

    3. How to is good for your health

    Laboratory within the fume hood is not used to also want to often ventilated, so beneficial to the physical health test personnel. Fume hood when use, every two hours for 10 minutes to fill the wind (i.e., a window ventilated), use time more than five hours, to open the window, avoid indoor appear negative pressure.

    Not when you start the fume hood is prohibited in the ventilated enclosure experiment;

    Is not permitted in the experiment head into operation in ventilation cabinet or view;

    Ban in ventilation cabinet do national emissions of organic substance and high chloride mixed experiment;

    Prohibited in the absence of security will experiment material placed in ventilated enclosure experiment, once appear, chemical splash out, should be immediately cut off the power supply;

    Operating area of the fume hood to keep open, avoid store things around the fume hood Operators in when not in use of fume hood, fume hood mesa stored to avoid too much test equipment or chemical substances, long-term pile up is prohibited.

    4.控制风速
    通常规定,一般无毒的污染物为 0.25—0.38m/s ,有毒或有危险的有害物为0.4—0.5 m/s ,剧毒或有少量放射性为0.5—0.6m/s ,气状物为0.5m/s ,粒状物为1m/s 。为了确保这样的风速,排风机应有必要的静压,即空气通过通风管道时的摩擦阻力。确定风速时还必须注意噪音问题,通过空气在管道内流动时以7—10m为限,超过10m将产生噪音。



4. Control the wind speed

Usually rules, nonpoisonous pollutants commonly 0.25-0.38 m/s, poisonous or dangerous pests of 0.4-0.5 m/s, highly toxic or radioactive for a small amount of 0.5-0.6 m/s, 0.5 m/s air synthesis, granular material is 1 m/s. Exhaust fan should be necessary in order to ensure that the wind speed, the static pressure, the frictional resistance of air through the ventilation pipeline. Determine the wind speed must also pay attention to the noise problem, through the air in the pipe flow is limited to 7-10 m, more than 10 m will produce noise.



 
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